James Eric Davis, Jr was arrested for the shooting death of two people at Central Michigan University on Friday, March 2, 2018.

A 19-year-old student accused of killing his parents at a Central Michigan University dorm used a gun registered to his father to carry out the deadly crime, police said Saturday.

Authorities arrested James Eric Davis Jr. without incident just before 1 a.m. Saturday morning after a 17-hour manhunt, which included more than 100 police officers.

The Friday shooting unfolded around 8:30 a.m. at a residence hall on campus as parents arrived at the university to pick up their children for the upcoming spring break.

A day earlier, the suspect had been acting strangely, telling a residence hall officer that someone with a gun "was out to hurt him." Authorities later determined there was no threat and gave Davis the "okay" to go home for spring break, Central Michigan Police Chief Bill Yeagley said Saturday.

Later in the day, Davis was spotted in the halls of a dormitory again acting strangely. Officers phoned Davis' parents and took him to a hospital for an evaluation Thursday afternoon. He allegedly shot and killed two people Friday after he returned from the hospital the same morning.

James Davis Sr. (l.), 48, and his wife, Diva Davis (r.), 47, were fatally shot by their son, James Davis Jr., 19, at a dorm room on the Central Michigan University Campus on March 2, 2018.

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Central Michigan University officials said the shooting stemmed from a “domestic” incident and later identified the two dead as Diva Davis and James Davis Sr. — the parents of the suspected gunman.

Yeagley also confirmed Saturday the weapon used in the attack belonged to Davis Jr.’s father, a part-time police officer in the Chicago suburb of Bellwood.

Yeagley declined to comment on whether Davis Sr. brought the firearm with him to campus, though security footage does show Davis Jr. in the dorm’s parking lot with the weapon before entering the building where his parents were gunned down.